[VAD] display VAD information in agents RDVs and calendar views
Created by: adipasquale
linked to https://trello.com/c/T9BNYXUH/595-vadagent-identifier-les-rdv-%C3%A0-domicile
I didn't fully respect the specs:
- I used emojis instead of fa-icons in the calendar view to simplify both coding and testing
- For balance I also added an icon for phone meetings